Apple is expected to dominate the tablet sector, accounting for 61% of the global tablet market this year. It's gonna turn into a fight with Android, which has been extending its reach in the tablet sector even more rapidly than it did in the smartphone sector, with a penetration rate reaching more than 30%.

Amazon's as-yet unnamed tablet poses a significant threat to Apple because of the Kindle's popularity and the movie and music services the company sells. Analysts also expect Amazon to subsidize the tablet's price, which could also boost sales.

The tablet will likely feature Android's Honeycomb OS system, a 7-inch screen and be priced under $300.